class Calculator
	{
	public int add(int a, int b)
		{
		return a+b;
		}
	public float add(float a, float b)
		{
		return ((float)a+b);
		}
	public double add(double a, double b)
		{
		return a+b;
		}
	public double areaOfARectangle(double length, dopuble breadht)
		{
		return length*breadth; 
		}
	public double areaOfCircle(double r)
		{
		return 3.14286*r*r;
		}
	}